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To preview a webcam in a web page, request video access with navigator.mediaDevices.getUserMedia({ video: true, audio: false }), assign the returned stream to a <video> element’s srcObject, and stop its tracks when the preview ends. The page normally needs to run over HTTPS, and the visitor must grant camera permission. The example below adds Start and Stop buttons, handles common failures, and does not request microphone access.
What a browser webcam preview needs
A live preview is not an image or a video file. The browser asks for permission to use a camera, then provides a MediaStream containing its video track. Assign that stream to a video element to show the live feed.
- A secure page: serve the page over HTTPS in production.
localhostandfile:///are documented secure-context cases for local development. - User permission: the browser prompts the user when the page requests camera access. Explain why the camera is needed and start the request after a clear action, such as pressing a Start camera button.
- A usable camera: permission does not guarantee a feed. A camera may be unavailable, in use, blocked by policy, or unable to meet requested constraints.
If navigator.mediaDevices is undefined, check the page’s security context before treating the problem as a JavaScript bug.
Show a live camera feed in a video element
This complete example requests video only, starts on a button click, reports errors in the page, and releases the camera when the user stops the preview.
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<video id="preview" autoplay muted playsinline></video>
<button id="start">Start camera</button>
<button id="stop" disabled>Stop camera</button>
<p id="status" role="status"></p>
<script>
const video = document.querySelector('#preview');
const start = document.querySelector('#start');
const stop = document.querySelector('#stop');
const status = document.querySelector('#status');
let stream;
start.addEventListener('click', async () => {
try {
stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: false });
video.srcObject = stream;
await video.play();
status.textContent = 'Camera preview is running.';
start.disabled = true;
stop.disabled = false;
} catch (error) {
status.textContent = `${error.name}: ${error.message}`;
}
});
stop.addEventListener('click', () => {
stream?.getTracks().forEach((track) => track.stop());
video.srcObject = null;
start.disabled = false;
stop.disabled = true;
status.textContent = 'Camera stopped.';
});
</script>What each part does
getUserMedia()requests a stream. The browser’s permission prompt is tied to this request; it is not a guarantee that a camera exists or will open successfully.{ video: true, audio: false }asks only for a camera feed. Do not request microphone access unless audio capture is a deliberate part of the feature.video.srcObject = streamconnects the live stream to the video element. A file URL such asvideo.srcis not the right way to attach this stream.- The Start button makes the permission request understandable and avoids prompting as soon as the page loads.
- The Stop handler stops every track and clears
srcObject, releasing the camera instead of merely hiding the preview.
Why autoplay, muted, and playsinline belong together
Use autoplay muted playsinline on the preview element. Muted inline video is the practical pattern for autoplay; Safari requires playsinline for autoplay. Autoplay rules apply both to the autoplay attribute and to a JavaScript call to video.play().
The example still calls and awaits video.play(). That makes a rejected playback promise visible to the same error handler as a rejected camera request, rather than leaving the user with a blank-looking video element. If your interface has a separate playback control, handle that promise there as well.
Choose a camera or request a particular resolution
Begin with the default camera
For a basic preview, { video: true, audio: false } is the simplest request. Add constraints only to meet a real product requirement. For example, a 1280-by-720 preference can be requested as:
const stream = await navigator.mediaDevices.getUserMedia({
video: { width: 1280, height: 720 },
audio: false
});A requested resolution may not be available on every camera. If a constraint cannot be satisfied, the request can fail with OverconstrainedError; provide a fallback or relax the constraint rather than leaving the preview unusable.
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Offer a camera picker
If users need to choose among cameras, obtain device information with navigator.mediaDevices.enumerateDevices() after permission, then request the selected camera using its deviceId. Device information may be limited before the user grants permission, so do not assume a complete picker list is available before a successful access request.
Use constraints as preferences unless your interface explicitly handles a device that cannot meet them. A picker should also handle the case where the selected device disappears or is unavailable when the user starts the preview.
Make the preview work inside an iframe
An embedded page may be blocked from using the camera even when the visitor has granted permission. The parent page must delegate camera access through Permissions Policy, including an appropriate camera policy and allow="camera" on the iframe. A NotAllowedError in an embedded preview can therefore indicate a policy restriction, not just a visitor denial.
Explain camera errors and recovery
Show a useful status instead of replacing every failure with “Camera unavailable.” The example exposes the error name and message; a production interface can turn those into clear next steps.
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| Error | What it can mean | Useful response |
|---|---|---|
NotAllowedError |
The user denied access, the page is insecure, or Permissions Policy blocks the request. | Explain how to allow camera access, check that the page is served securely, and, for an iframe, verify camera delegation. |
NotFoundError |
No camera satisfies the requested video constraints. | Check whether a camera is connected and retry with less restrictive constraints. |
NotReadableError |
Permission was granted, but the operating system, hardware, or page could not read the camera. | Check whether another application is using the camera and whether the operating system can access it; then offer a retry. |
OverconstrainedError |
The requested width, height, facing mode, or device selection cannot be satisfied. | Relax the requirement or try a different camera instead of repeatedly requesting the same constraints. |
TypeError |
The constraints are empty or false, or the API is unavailable in an insecure context. | Check the request options and page security context before changing camera hardware or permissions. |
These causes can overlap in a user’s experience: for example, a blocked insecure page may look like a permission problem. Preserve the error name for debugging, but give visitors an action they can take rather than asking them to interpret an exception.
Stop the camera at the right time
Stopping playback visually is not the same as stopping camera capture. Call stop() on every stream track, then clear video.srcObject. Keep this cleanup in the Stop control and also call it when the application ends the preview through another route, such as closing a camera dialog or navigating away within a single-page interface.
Browsers display camera-use indicators while access is active. Make the preview state and Stop control clear, and request no microphone permission for a camera-only feature. If a user stops the preview, release the stream rather than leaving it open in the background.
Compatibility and legacy code
navigator.mediaDevices.getUserMedia() is the modern promise-based API and is widely available; MDN records browser support beginning in September 2017. Use it for new work. The older callback-based navigator.getUserMedia() method is deprecated. Permission interfaces and autoplay behavior can differ by browser, so test the actual browsers and devices your application supports.
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Troubleshooting: how do I preview my webcam in the browser?
The permission prompt never appears
Confirm that the page is in a secure context and that the request runs after the Start button is clicked. If the page is embedded, inspect its camera Permissions Policy and iframe allow setting. A previously denied permission may also prevent the expected prompt; the visitor may need to change the browser’s site permission.
The browser says access is unavailable
Check for a connected camera and whether another application or the operating system is preventing access. Confirm that your code requests only the constraints the device can satisfy. Use the actual error name to distinguish a missing device from a hardware-read failure or a constraint mismatch.
The video element stays blank after permission
Verify that the stream is assigned to video.srcObject, that the element has autoplay muted playsinline, and that the awaited video.play() promise is handled. Permission alone does not establish that playback started.
It works locally but fails after deployment
Check that the deployed page uses HTTPS. Local development can work in documented secure contexts such as localhost or file:///; that does not make an ordinary insecure production page a secure context.
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The camera picker is empty or a selected camera fails
Enumerate devices after permission and handle unavailable device IDs. Start from a default-camera request, and do not assume that a selected device will remain present or satisfy every resolution constraint.
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Frequently Asked Questions
Can a browser preview a webcam without asking for permission?
No. The page must request camera access, and the browser requires the user’s permission before providing the camera stream.
Does this webcam preview code record or upload video?
No. The example displays a local live stream and does not record or upload it.
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